Dental handpiece



No. 623,469. Patented Apr. l8, I899.

J. a. HAILER.

DENTAL HANDPIEGE.

(Application filed Oct. 25, 1898.)

(No Model.)

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Farsnr JOHN G. HAILER, 0F PHILADELPHIA, PENNSYLVANIA.

DENTAL HANDPIECE.

SPEGIFICATIQN forming part of Letters Patent No. 623,469, dated April 18, 1899.

Application filed-0otobcr 25.1898.

T0 ctZZ whom it may concern:

Be it known that LJOHN G. HAILER, a cilizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvementsin Dental Handpieces, of which the following is a specification.

My invention relates to that class of dental handpieces in which the tool-carrier can be adjusted so as to cause the tool to project at different angles, the object of my invention being to provide compact and efficient means for driving the tool in its different positions of adjustment. This object I attain in the manner hereinafter set forth, reference being had to the accompanying drawings,in which Figures 1, 2, and 3 are sectional views of the handpiece, showing the tool in three different positions of adjustment. Fig. 4 is a view, partly in elevation and partly in section, on the line 00 00, Fig. 1. Fig. 5 is a view illustrating the locking device for the tool, and Fig. 6 is an enlarged sectional view of one of the driving-wheels.

1 represents the stem of the handpiece, which is intended forapplicatian to the sheath or casing of the usual flexible shaft, whereby the spindle 2 of the handpiece is driven. The spindle 2 is adapted to a bearing in the stem 1 and is provided at its inner end with a bevel-wheel 4, which meshes with a bevelwheel 5, mounted so as to turn freely upon a transverse spindle 6, which is carried by the projecting cheek-pieces 7 on the stem 1 of the handpiece. One of the cheek-pieces 7 is thickened, as shown in Fig. 4, and in this thickened cheek-piece is formed a threaded opening for the reception of a threaded portion of the spindle 6, the ends of said spindle Secured to and rotating with the bevelwheel 6 is a spiral toothed gear 8, which meshes with a similar spiral toothed gear 9, having its axis at right angles to the axis of the gear 8 and having projecting hubs 10, which can turn freely in bearings in a pivoted carrier 11, the latter having cheek-pieces 12, which bear against the outer faces of the cheek-pieces 7 of the stem 1, as shown in Fig. 4, and are mounted upon the projecting ends of the transverse spindle 6, so as to be free to swing around the axis of the same.

The bearing for one of the hubs 10 of the fierial No. 694,541. (No model-l gear 9 consists of adetachable nut 13, so that said gear 9 can be readily inserted or removed from the carrier 11, and to the bore of the gear is snugly fitted the stem of the tool 14, the latter being retained in position longitudinall-y by means of a swinging catch 15, adapted to a groove in the projecting end of the stem or by any other suitable form of retainer. The stem of the tool is flattened, as shown at 16,'and the bore of the gear 9 is correspondingly shaped, so that the tool is.

compelled to rotate with the shaft,and a shoulder 17 is formed, as shown in Fig. 6, to resist the thrust upon the tool.

The outer ends of the check-pieces 7 are segmental and are provided with notches at suitable distances apart for the reception of the 'inner end of .a screw-stem 18, which is adapted to a threaded opening in the carrier 11, as shown in Fig. 4. \Vhen this screwstem is retracted, the carrier 11 can be swung around the axis of the spindle 6, so as to move the tool 14 to any predetermined position of adjustment, in which position the carrier 11 can be locked by screwingin the stem 18 until its inner end engages with the proper notch in the segmental end of the check-piece 7, the desired swinging movement ofthe carrier 11 being effected without interfering in any way with the proper meshing together of the spiral toothed gears 8 and 9.

The construction described provides a handpiece in which the tool can be driven with equal ease and readiness in either of its positions of adjustment, the fewness of parts and compact arrangement of the various ele ments of the driving-gearing enabling me to keep the size of the projecting portion of the handpiece well within the limits demanded in an instrument intended to be used in the mouth.

Having thus described my invention, I

claim and desire to secure by Letters Patcut- A dental handpiece consisting of a stem having a longitudinal spindle with a bevelwheel thereon, a transverse spindle having a bevel-Wheel thereon meshing with the bevelwheel on said longitudinal spindle, a transverse spiral toothed gear secured to and rotating with the bevel-wheel on the transverse spindle, a second spiral gear mounted to turn ln testimony whereof I have signed my name to this specification in the presence of 10 two subscribing witnesses.

JOHN G. IIAILER.

\Vitnesses:

WILL. A. BARR, J 0s. II. KLEIN. 

